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Unformatted text preview: a and constant wall thickness t a. Calculate the twist angle ( θ ) as a function of a, t and G. b. If the cross sectional material area A=4at=10 cm 2 is fixed (fixed weight), calculate the optimum thickness for minimum twist. c. Calculate also the shear stress as function of t for the fixed material area case. Name: 1. (32%) Answer the following questions a) What is the strain energy in a cantilever beam of length L, bending rigidity EI under an end load P? b) What is the physical meaning of the slope of the Prandtl stress function? c) How is Castigliano’s method useful as a shortcut? d) Write the condition for the neutral axis to be the x axis for a general cross section under general loading....
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 Spring '08
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